<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <p id="jss">JACVAVA</p>
  <div id="list">
    <p id="ee">ee</p>
    <p id="se">se</p>
    <p id="ms">ms</p>
  </div>
  <script>
    var ll = document.getElementById('list')
    // ll.innerHTML = '<p>hi</p>'
    // 追加
    var js = document.getElementById('jss')
    ll.appendChild(js)
  </script>
</body>

</html>